WordReference Random House Unabridged Dictionary of American English © 2020
noc•u•ous  (nokyo̅o̅ əs),USA pronunciation adj. 
  1. likely to cause damage or injury;
    harmful;
    noxious.
nocu•ous•ly, adv. 
nocu•ous•ness, n. 
  • Latin nocuus harmful, injurious, equivalent. to noc(ēre) to harm + -uus deverbal adjective, adjectival suffix; see -ous
  • 1625–35

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